Battery charger



FIG. 1 is a top perspective view of a design for a battery charger of the present invention;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. In addition, the dash-dot lines directly adjacent to claimed areas are included to represent the boundaries of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described above. 